Geodesic
Approximation of Differentiable Functions in the Uniform Metric
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Studies on function theory and differential equations, Tome 248 (2005), pp. 223-236

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The relationship between pointwise approximation of continuous functions by algebraic polynomials on a closed interval and a pointwise structural characteristic of differentiable functions is considered. 
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     author = {M. K. Potapov},
     title = {Approximation of {Differentiable} {Functions} in the {Uniform} {Metric}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
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     year = {2005},
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     url = {http://geodesic.mathdoc.fr/item/TM_2005_248_a20/}
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M. K. Potapov. Approximation of Differentiable Functions in the Uniform Metric. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Studies on function theory and differential equations, Tome 248 (2005), pp. 223-236. http://geodesic.mathdoc.fr/item/TM_2005_248_a20/